Polarimetric Er^3+-doped fiber distributed-feedback laser sensor for differential pressure and force measurements

Abstract

We propose and demonstrate a polarimetric Er(3+) -doped fiber distributed-feedback laser sensor in which a force applied transversely along the fiber laser induces a birefringence that gives rise to a change in the beat frequency between the two orthogonally polarized laser modes. We measure a sensitivity of ~9.6 GHzysNymmd, a wide dynamic range with stable two-mode operation for frequency separations up to 50 GHz, and high sensor resolution owing to the narrow beat frequency bandwidth of <10 kHz. The temperature sensitivity is dominated by the temperature dependence of the inherent birefringence, which was measured to be -130 kHz/ degrees C. The sensor permits independent pressure-force and temperature measurements.

Frequency and Intensity Noise of Single Frequency Fiber Bragg Grating Lasers

“…∠H 0 f r (expressed in radians) is the stability phase margin of the roundtrip function H 0 . From (9) and (10) we obtain…”

“…Compared to other sources, fiber Bragg grating lasers have the advantages of a compact in-fiber design, easy and accurate wavelength selection during production, a large potential wavelength tuning range without mode-hopping through strain or temperature tuning, and the possibility of creating multiple wavelength sources that are pumped from a single diode pump laser, either through serial laser multiplexing [6] or by sampled grating techniques [7]. Fiber lasers can also be used as sensor elements themselves, as demonstrated in [8][9][10]. The ultimate accuracy of such fiber laser sensors is also limited by the intrinsic laser frequency noise.…”

Experimental study of a symmetrically-pumped distributed feed-back Erbium-doped fiber laser with a tunable phase shift

“…The distributed feedback (DFB) EDFLs possess of the main advantages of EDFLs. They are promising light sources for applications in communications including microwave generation [5,6], sensors [7][8][9], spectroscopy [10,11], etc. A DFB FL usually consists of a uniform fiber Bragg grating (FBG) written in a rare-earth-doped optical fiber.…”

Experimentally verified modeling of erbium-ytterbium co-doped DFB fiber lasers

“…E RBIUM-YTTERBIUM-co-doped fiber distributed feedback (DFB) lasers are important devices, finding applications in many areas ranging from telecom [1]- [3] to sensors [4]- [6] due to their inherit fiber compatibility, stable single longitudinal mode, and single polarization operation. In addition, their emitted signal wavelength can be set accurately with passive stabilization.…”